Vat dyestuffs of the benzanthrone acridine series and the process of making them



Patented Sept. 18, 1934 UNITED STATES PA EN oF cE VAT DYESTUFFS OF THE BENZANTHRONE ACRIDINE SERIES AND THE PROCESS OF MAKING THEM Hugo Wolff, Mannheim-on- -the-Bhine, Germany, v I

assignor to General Aniline Works, Inc., New York, N. Y., a corporation of Delaware No Drawing. Application June 15; 1931,Serial No.

p 7 544,691. In Germany July 8, 1930 6 Claims. (01. 260-36) My present invention relates to a process for producing vat dyestuffs of the benzanthrone series, of which the simplest representative corresponds probably to the following formula the other dyestuffs containing substituents in 6- or 7-position of the benzanthrone residue and/ or in 43-, 5- or 6'-position of the anthraquinone residue. g

Several ways have been already proposed to produce vat dyestuffs to which the ring system represented by the aforesaid formula is common.

I have now found a very simple method of producing vat dyestufis of said class which process comprises heating equimolecular mixtures of a bz-l-nitro-2-chloro-benzanthrone compound of the general formula I 7 N0: 1 In which both Xfs mean hydrogen or one X hydrogen and the other halogen, and of a l-aminoanthraquin'one compound of the general formula I NH; O

' injwhich the Ys- -and Z mean hydrogen orone Y; and Zjhydrogen and the other Y representsan spondingly high boiling "aromatic diluents, such as nitrobenzene, naphthalene, u-nitronaphthalene or benzophenone, and with the addition of an acid binding agent and a copper compound acting'as catalyst. i

The reaction probably occurs in such a way that the 2-benzanthronyl-l-amino-anthraquinone compound is formed and, while evolving nitrous gases, ringclosure between the bz-l-position of the benzanthrone compound and the 2-position of the amino-anthraquinone compound takes place and vat dyestufis'of the aforesaid type are obtained.

In some cases it is advantageous to isolate the 2-benzanthronyl-1-amino-anthraquinone c o m pound as intermediate and to effect the ringclosure in a second phase. For this purpose one may carry out the heating o f the components under relatively milder conditions, i. e. by interrupting the heating after a short time or by heating at temperatures not above 200 C. Theringclosure of the isolated intermediate may then be effected by heating at'temperatures from 200 to above 300 0., preferably in the presence of correspondingly high boiling aromatic diluents as stated' above.

The vat dyestuffs obtained accordingto my 1 to violetish colorationQ They dye the vegetable fiber froma bluish to violetish vat green to blue shades of goodfastness.

In order to further illustrate my invention the following examples are given, the parts being by weight and all temperatures in centigrade degrees. However it is to be understood that my invention is not limited to the particular products nor reacting conditions mentioned therein.

Example 1 20 parts of bz-l-nitro-2-chloro-benzanthrone are mixed with ;16 par-ts of l-aminoranthraquinone, 6 parts of ficalcined sodium carbonate; 0.3 part of copper bronze and about 200 parts of,a,-ni-. tro-naphthalene, and the mixture is slowly heated to boiling. While evolving nitrous gases, the coloration of the reactionnaass turns into emerald green. When the intensityofthis, coloration is no longer increased, the reaction mass is cooled down to about 100, about 200 parts of warm nitro-benzene are added andjthe "pr ip a i filtered off at about 80 and washed 'out with warm nitro-benzene, alcohol and water-:

a crystalline greenish black powder. 1

Instead of copper bronze, copper oxide or other,

The dyestuff, thus obtained;, the form oi needles of a" bright metallic green lustre.

blue needles soluble concentratedjsulfuric acid with a'blue' color andl dyeS; they bright dark green shad ne ably to the formulazf amino-,anthraquinone, 4 parts-of: calcinedsodium.

. carbonate, 0.3 part of copper bronzeand about 3001 parts of naphthalene andthemixture isfheate'd,

ro-benaene, the precipitate is;fi1,te ted1oif;a't about and isolateclin theusualmanner; ."Thezdye-i copper compounds may be used with the same salt of the dyestuff is obtained in the form of,

while stirring, at.2 10-21 5 for.aboutl8- l0;hours. Thereactiommass is then cooleddownto about 100:an d diluted with about 500.;parts of OF 'di-ChlOb...

stuff thus obtained represents; a giieenishtblacki powder soluble in concentrated sulfuric acid with a violetish brown color. It may be purified by extracting it with a suitable solvent, such as o-dichloro-benzene at 120-140".

The dyestufi thus purified dissolves in concen trated sulfuric acid with a bluish red color and dyes the vegetable fiber from a bluish vat bright and fast olive green shades. It corresponds probably to the formula:

5 parts of b2-1-nitro-2.6-dichloro-benzanthrone are mixed with 3.5 parts of 1.6-cliaminop I I H l anthraquinone, 3 parts. of calcinated sodium carboiling it h m n? t ei reg'b se r' h 'd eei stufi is isolated ina. very pur' e' crystalline state. The dyestuff thuspurified'represents bright sjteeldyestuff which contains chlorine represents a r dark powder solublein concentrated sulfuric acid with a violetish blue color. table fiber from a brownisheviolet vat grayish blue shades. V rnula:-

It dyes the vege- It corresponds probably to the for- NHQ 2-chloro-benzanthrlone aand condensing-- it with" G l'fi-diamino-anthraquinone or another suitable diamine of the anthraquinone series.

Examples! 5 5 parts of bz-"l-nitro 2.Fdichloro-benzanthrone are mixed with 3.3 parts of l-aminoanthraquinone, 2 parts .of calcined sodium carbonate, 0.1 part of copper bronze and about 100 parts of a-nitronaphthalene, and the mixture is heated to boiling for a short time. When working up the reaction mass as described inthe foregoing examples, the dyestuff is obtained in the form of a greenish black powder. which ;may be purified by extracting it with a suitable solvent such asdichlorobenzene or nitrobenzene at 120- 140". The purified dyestufi containing chlorine dissolves in concentratedsulfuric acid with a violetish blue color and dyes the vegetable fiber from a violetish blue vat grayish green shades. It corresponds probably. to the formula:- I

A similar dyestuff is obtained by condensing bz-l-nitro-2.G-dichloro-benzanthrone with 1- amino-anthraquinone. i j

Example 5 with about 150 parts of nitrobenzene.- The dyestuff separates already during the heating in the form of little crystals which arefiltered off after cooling down the reaction mass to about 100 and washed out with warm nitrobenzene and alcohol.

The new, dyestuff thus obtained in the form,

of bright steel-blue needles is identical with the dyestufi of Example 1. r Instead of nitrobenzene, other suitable ardmatic compounds, such as nitro-naphthalene, naphthalene, benzophenone may be used as solvents. 5

Emample 6 3 parts of 2-(bz-l-nitro-benzanthronyl) -1'- amino-anthraquinone; obtained as described in Example 5, are heated at BOO-330 in a suitable apparatus for some time. While evolving nitrous gases, the originally reddishi brown condensation product turns into greenishblack. By dissolving it in concentrated sulfuric acid and precipitating it with water, it may be brought into the form of densed under mild conditions ,withone molecular proportion of l-amino-anthraquinone and 1 part of 2 -(bz -1-n'itro-7-chloro benzanthronyl) 1L- amino-anthraquinone thus formedand isolated in the usual manner is poured into parts of 2-nitro-1-.4-dichloro-benzene"at about 100 and the mixture is heated to boiling for about, l'hour. The originally red coloration of the solution slowly turns frombrownish olive into an intense green. The reaction mass is cooled, down to about 100 and then diluted "withlabout .80: parts of nitrobenzene a'ndthe precipitate is filtered off at about 50 and isolated in the usual .manner. The dyestufi thus obtainedwith a good yield is identical with the dyestufi ofExaniple4. I p

' A similar dyestufi is obtainedbyheating the 2-(bz-1-nitrof-6-chl ro-benz'anthronyl) -;1.-a'm inoanthraquinone to higher temperatures. :5

Example 8 reaction mass slowly turns into an intense emerald green. When the intensity of this green coloration is no longer increased, the reaction is completed. After cooling down the reaction mass to about 100 it isdiluted with the same quantity of cold nitrobenzene and the precipitate is filtered.

off at about 60 and washedout with nitrobenzene and alcohol.

obtained as a black powder soluble in concentrated sulfuric acid with? a blue color. When pouring this solution into an aqueous solution of sulfuric acid, a grayish-blue paste is obtained. From a blue vat the vegetable fiber is dyed The new dyestuff correformula:

grayish blue shades. sponds probably to the Similar dyestuffs are obtained when heating to higher temperatures condensation products obtained by condensing under mild conditions bz-l-nitro-2-chloro-benzanthrone or bz-l-nitro- 2.67 a or -2.7-dichloro-benzanthrone suitable diamino-anthraquinone.

In this manner the new dyestuff is with another Example To 500 parts of molten naphthalene at about 100 10 parts of 2-(ba l-nitro benzanthronyl) -1- amino 4'- benzoyl amino anthraquinone, obtained by condensing under mild conditions "equimolecular proportions of "bz- 1'- nitfo-'2 -'chlorobenzanthron'e and of 1 arninot-b'enzoyl amino anthraquinone, are added and the mixture is' heated to boiling for several hours. When the formation of the dyestufi' is* 'completed, the re'- action mass is cooled down toahout 100 and diluted with 5001parts of warm ogdichlordbenzene; The precipitate-is filtered oft-at about" and washed out with warm-o-' dichlorobenzene -until the filtrate is only slightly greenish colored. The dyestufi is identical with the dyestufi of Ex amplm p I 1. A process'for producing fvat'dyestufls of the benzanthrone-acridine series which comprises heating-equimolecular mixtures of a bz' l n'it'ro- 2-chloro benzanthrone compound of the general formula: Y

in which both Xs .meaii hydrogen or on'e X hydrogen and theother halogen, and of a 1 amino-anthraquinone vcompound of the general formula:

drogen and the other halogen, and-of a l a niino imam? anthraquinone zcomp'ound'rofhthe general ''for'-' mula: 7' v NHz O heating -'equirnolecular'mixtures of a bz-l-nitro- 2-chlorobenzanthrone compound of the general formula:

in which both Xs mean hydrogen or one X hydrogen and the other halogen, and of a l-aminoanthraquinone compound of the general formula:

in which the Ys. Z lmean hydrogen or one heating. equimjolecular miir'turesof a hz-l -nitroz-chloro-benzanthrone compound of the general formula: l

in which both Xs mean hydrogen or one X hydrogen and the other halogen, and of a l-aminoanthraquinone compound of the general formula:

NH: O

in which the Ys and Z mean hydrogen or one Y and Z hydrogen and the other Y represents an acyl-amino-group or the Ys mean hydrogen and Z an amino-group, to higher temperatures ranging from 200 to above 300 C. in the presence of inert high boiling aromatic diluents and with the addition of an acid binding agent and a copper compound acting as condensation catalyst with interrupting the heating in order to isolate the corresponding bz-l-nitro-benzanthronyl-l'- amino-anthraquinone compounds as intermediates and continuing by heating the isolated intermediates at temperatures from 200 to above 300 C. with the addition of an inert high boiling aromatic diluent.

5. As new compounds vat dyestufis of the benzanthrone-acridine series corresponding to the general formula:

which dyestuff is when dry a blackish powder soluble in concentrated sulfuric acid with a blue color, and dyeing the vegetable fiber from a blue vat grayish blue shades of a good fastness.

HUGO WOLFE. 

